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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd38bd1cb9b0dac65e68686295aed3a83b3b9f08659db47bb6196b68d22af1db6' 
  AND token = '/N5p9mWl4L3t5iSH1TN1hN7TZy0ycejYsSakTBA8My8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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