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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16e248f03184309079dd9b24caba06f3601dee2a70b41e24827830dc5007344c' 
  AND token = 'iRPWm2mx9BSu5tXyr/d53UJ2Ecd8e+ypmvz5s91cEkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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