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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd574b138823c0de17ef0504ba9aa9eda0f22bd4992f26489a31cb7090026a35' 
  AND token = 'S1Fw/Z50fbnZCmFEut9RWE3jrEJyAG/lg1h+X16WQ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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