SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1281cdfd94051bcd939b3d105aa6b92677d57fc06857df91002c1e59c98b8a9' 
  AND token = '+QxPoiXro/f8J6F/qmUv3LPWWviTYVogrJ2d6Maq5UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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