SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf020a9412f0608357352edc12fc66a1ac61425ef1836f9968cab519b4a7baa9' 
  AND token = 'i7siLhhQqJqPKokKBf6r7yrusXGgDjsxoRWB3WzdpeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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