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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4442966e48cb1adbbd637e9408ee04be9a9a25f9f9ecb784fd34528b2a3f4e14' 
  AND token = 'QM03GtOli0ToQmKFFO5MXXiKFcI2QzZDs7AYIGFl1v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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