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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0611fcf34aaaa33714ff7598074bac6eca69e793c27a3d65b8537aefa5e3514f' 
  AND token = 'iju7NKT0kQPfdcjJr0Y8jc2NW1Q3qLBfXmYiNbO82HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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