SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3f4693ffa06f7a692ef8e95cef7bd5c8e1467f7ed4d9a6d6917018172f9dc59' 
  AND token = '/D/gpVy18t1WfLBnCYP5/qu3NpjdIwRipvvSi6z0EG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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