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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23ddcd40627b40b6310a516c3726a35948244c63500ec2899f4664602cca4f6a' 
  AND token = '/zD2qswL8y+x4OZqLsuFD3+4U4uyw8nULAvCU68axnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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