SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c291a9202492fa32e54bfc20d80f14963a85ff81bce11bcd103efbcd17e63146' 
  AND token = 'jqZLBTdPgrXjHFT92Qqsh7Ry5MwdiDfhqiIZkqQK0u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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