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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '627477c464fb7ba1da3e2cc66c7e84e5dda1e7aedacb7e4c184b1d6ab0388942' 
  AND token = 'LVc9nEd2H6ktHScISM3w8RPOscZUPjmJJ8xPBxUhIN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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