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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38b0e6f366e84ba5db415776be0dd8c5fba05a8f936ea160ea9391e230468b7f' 
  AND token = '7DQLii66DJ6lvZmKLd/liDpY5hQpVbEQuT5V8cTRHN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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