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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7412f33a43ae012a5ad55ec002849a733f0da3cf9faa2804cf185098aaf20eb' 
  AND token = '4B4mCAJbK0K1yI8vHXhXiflBrWZOkoarTptjJfZIXX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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