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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '356dda2191f10fa5ffc95aa5bbc0746a735cc0763b80ed983c6e6b90f551795e' 
  AND token = 'j06P/roIqfsQEqrX30U8Dor2QCNBUr+lL1J7ScP33NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}