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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e1a622441e4d69b3888fe688b564e00704eb0df8ef2f7cbe3eb01ad4058a891' 
  AND token = 'gx8tmQBZ7dYqDPY9UQf9NZQQBTpoDqmeXp5sr6EAUpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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