Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4b50958b7e95004625fcb1b5b1191ef301caffd69aa79ea36e60f0eddf2a29b' 
  AND token = 'VfXw0n/cDeLxglQptfSTEbNqVsLLb7W0JzYG0qAQOV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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