SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0130718ddb7af2fb02353c62df0a513e9b23bb44b535121b70648f922c3dd284' 
  AND token = 'QrA9ZYSHl1WBBjD0YIm044KgwhnOXQ490DRwcPPor/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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