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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8b10f7901470dc8c9dcb0e3cec8b35acc938ef7e9bbff0e2d2895a2f25f08aca' 
  AND token = '7f/f+HxBu6MYo5FfCcDP29KHgd5tfDb3amWfCjOnM9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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