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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a57a11a834b2177e0791ac7362e952f4420ff5ae1d3dadb7934216aaa3d10c4c' 
  AND token = '0XoubMs5nRYASp86LNRGFhUvvUErlNwzph+vGeYT2kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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