SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0ea82f31cfe00ac607d25ff14c89fc57b1369804935894909951162b59b3cb4' 
  AND token = 'TKo12p4zhuu6ssfZOz/63io0HyYGVq/ydODEyLZTKNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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