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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc1534d3853223a34f76e08c704eb4bbdc5f6d8c048f286efcf47cc1aa4d04f' 
  AND token = 'E6gn5jZsurfCHVOaXgihA7NRerjWMMfwrw+p7GZvjJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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