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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37e3c151ae657f9349c76b5526bc73744283a299d82d2fc4b71708893fd35b2d' 
  AND token = '7kP7kiYMNMmRPodocix4Ou1yIeHpFoEyFYkaUJoRL9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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