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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41e6504b0b28e29da04cd56c3537291a5a95b5240dfbf311c8d849f8eaefc59e' 
  AND token = '9/oFsiaW7W37Q6sb+5Yir+usb/SGFvm8Yergx0ez6qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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