SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef635d39251a984c75d71ac7b043ced52c3cb8b6c368ceb1c7bdfea04201d661' 
  AND token = 'E3aOjq80afhfp/2XDZfj1KtVKw2Hvz3awzjuGWHDyPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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