SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79834cb9afd0f6c5e0268e2d915205a445b69af4460c1a50016169743311b80f' 
  AND token = 'GczW2fG/CuAzqB9PRtKGsAMUx8TO7Jw0kPoPfFEK2Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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