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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd088e374c0dbd4807dc98ffae88601a1e4cf89d4cb61412004baebed3e4f2b9' 
  AND token = 'P6VgwAmVklvkWMNgSM+nZQrPloyacpEJa0ISqlJV61s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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