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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73f4aa5a3bdadf88efd5c077511b9dc847adb9b903b7ca416f579872e5d17960' 
  AND token = 'MCpB2zpIgfd8GNw+QLm8puM+aAYz1aLldEaLKP+Yui8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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