SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fabd90d5462159806269a5a8b7ad385fb8b3bffcd0461e346fc42534f9e9ccce' 
  AND token = 'L9zsVbTp2/UJXRSUsNgog6kMaddI4w4lTL+91KMhjKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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