SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dec2c3657f49f787ba3d25711d6b667f8670f5b1789d40656df844b7c299895' 
  AND token = '8d+ULFOJ/x7eWsILZhigXKdcPBWggK6ymqkfFAiswOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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