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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0889b55ef86be47ba8d3925ce07ef393db3da5ea2bc88dfd84d8ad55ee5d466b' 
  AND token = 'dREpIJ8hb7V6IHSYa7W5f3HczQPWAyZJUZ6WTnSU55U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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