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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f559bd3b88dba536a516f935f34be05b1d096e5a5dc3fe778f6ecaa826cb1623' 
  AND token = 'oYoOV0YO45Og/mR+Sl/kc1q/fiCD0Y27t0BEDdkpck8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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