SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a74197db74d012dd99089822e4f9e47ab284afa9dac6dd8b61325fccabf0d246' 
  AND token = '+iiPmT5qMBzTjH1BK9LZoJPrrXtz3tlHTpcGB2B0JKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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