SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97809267f2a6c8db629e3d6b11ca0f0c4862e4ef13caf07c98efaed98376945f' 
  AND token = 'Cmllkv4EgSuREhHVcysZq6YkCB5GWWZECgNpwSfE/Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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