SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41d6146d326971dc8418492e0d2b158a68af005b178a93576924ea91f9796e8c' 
  AND token = 'gH9Zi+AB5C/3ZXQxWWGTRZMU5PEqFDzFqbkv1K2XJZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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