SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97c82e12fbd09b605c18545be9b7b4b3f1e430ee5f34e243b7e271f4248b256e' 
  AND token = 'lYz8WSJrK90vVajKlEjvut/T6a+RXN+1Vlx3B5zggOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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