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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db6bc6bbb4491b59864c4d2fd12d8bf1fbd38f5b68ae728bb5edb6c8befb4507' 
  AND token = 'vTx8tsqT/XV6TstpUdiHS+dnm4+vvDMQ6ZsCmR9lePk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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