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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adca6cbb4b8c92b755c88910f3af3108d41aa96b00b9239967625db837768f63' 
  AND token = 'xd9ZKp6tnln50evudXVRjZfkSOM1WZnw9Uh3zQFk9x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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