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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c73d0a0709f342154ec90276ed1198e9ce74b7f25eef68686faf9f107ea1a74a' 
  AND token = 'w/dk5HoFQUnOiGxd2hycj2KjcxHHvlAzMUnXeiwbHTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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