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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ed4e8fe36211cec51de5b20468b1e7d77aab9f61503e84dd808388b1fbe6404' 
  AND token = 'lgG9ba8FkPaSpI33BTt7fpYITA2rP3u8+rF1NGg5P0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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