SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26a2b8bb0ce1b442321efd8bd5847cfc0e0d4caa6d49791c744052fb26965707' 
  AND token = 'k8EI+QOjuNJqXHTIg4y3pN96XrL+pB1V7JMEqOoNzWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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