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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c65a55e80d17c8d79959fe26b5a9ec6991b428ea026a7bfcc4ceb7ebc8df080' 
  AND token = 'moT7EpRWMPj7ie2Os8EpjwXpI/M3s4fmQss7x0VDSEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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