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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '049d81cb841f958f56f5ecf85a43f374000ab6323c353bcd30a70c0dcf8e3b40' 
  AND token = 'PIw5SCjN5047VHIMMAgIo6aiymElzK+ZOIgaoIISMKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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