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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '720b22281ecef3eeb234ca26ef644a1a43f362e7358e47045ccb21e8fc2874cf' 
  AND token = 'CbFppFGwGp2usueM9MSnKn3w39ltyrJUxQFLaO211nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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