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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99d5b4fc3e7c3c75627ea50e4d9c1af3c2b0e3747957bd41a93795d971df4dd7' 
  AND token = 'vlgmpiWBGIHrxl5nLRxT04KWphZJb8Sz12iGpEW3SJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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