SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a7dd5aa98fb02e3cea835948ad4eca10c0ebe6bb555b4fcb9e356de16602799' 
  AND token = '7vDJPC4ZZMZXKm4s5gOV6W7p5/pKSjsGUxXE71VffpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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