SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffab051ce18991e2525335f8bb49b77925662c4a17d4bf62062778bedd933e94' 
  AND token = '2pM05RAwwJiq0aJhfnI+wSThCB+pSOgDpxN5jLiKzCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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