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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dd79bb07af5d3a2650e3d2ec707ef4826cacff4c2fa63361be8bc77f2e74838' 
  AND token = 'r1TB35DMGR9EGx478otdYvpr9qF+Q1CeogreqgFft3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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