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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fb7d3b888a5998dbffabfae89a7c733332862f8bcaa52c3db1d97ec5f1b6a3c' 
  AND token = 'njhFk7vTPXzCE1hmoUj6Oi6FimI4aEBONsP7/wGv4L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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