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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d5c620f59074801c31ff0fd69f596e2eec2746b58c5a3d5e8473c2bda6276b7' 
  AND token = 'HXhNAiuq6QfjUWkNOv+eJFE+LfXmUm70jNgXHEig0Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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