SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5aa8cde917f766da96ce3277f4fe4276fa5517b7b5270c60fe4ff8e990240555' 
  AND token = 'WUC2qPd6YLCo0NJEVygBvTCAyChSjm9KBEA6H1EDAw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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