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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a339b916972c65b954f7291d200388cd8cb3add4d228157b018cd72f5de30de0' 
  AND token = 'iHQ0NIho3nAsCRwQT3w5pZ4yS9w/P17S1pxuMtt16+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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