SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17be7ba501385185077cd8c1927ff1fbecf22ed51ad6659714b04001e28bc899' 
  AND token = 'HvwmgEOjeRtNPUrZ28agC+DPw2H5KLZkOU+IaBkORGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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