SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '368fbdf7cadf973db895998c22b1d1066bb20616ff6835a76c06044d13a6ef0e' 
  AND token = 'FOfZ2Rtytv/gzL6mnwS1BDm0tJXI7M/mhmlBrLE46AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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