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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e26141171b1feef19ca0ac2ab1c6e84b0dab8e2933c020c8d8c7223bf3a4637' 
  AND token = '9So8/3g5CQBV+OoCjnB8WDyrd0mkhYcRaW067ToN9rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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