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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9840e9111463c0a66f0c07998e6e55250b5e7d05409ac9ae6197da9c2801fd59' 
  AND token = 'RDHkTAO49F7K+hrnMjJcM5vrlojNz59BKftOdiDMZWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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