SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '439026cdfe8ba3bb89d98f8c821404d6d632f40a8a20d674f17cd7d5619775ee' 
  AND token = 'Ww2d6KxtxIgmLlF5wjPciMALYjQ1fv4BUYbL2XjlWJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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