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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c347c012e75c42630d0a19da29fa333855baa7d2d115a819a2a9cf5dbfd8643' 
  AND token = 'MAZOoNYkb+cvokLiGG6MH5ovXvgVmelpW9Xft2QMiEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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