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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd005516e8b21d28886494a41a484ecad703a0c8daf8036350cdcc67863e48094' 
  AND token = 'ThcBz1gnpAIJWSGy0ewPFezJmhs81XMdNkFb6vG9UjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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