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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bf48ac302f6d271d6f5f7a957c7de755667b1566534637f5d49187541cf5e0e' 
  AND token = '1UEy2ltd15Ytvquw9QYE/vM7dRLw3TeKFxqAqi+NCWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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