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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d0c35bb10af41d816da37e76ccafb3386690a4d51a9da459f600ef8d3730eb9' 
  AND token = 'gDjUyt6pQ+RYulQG6Buys0nc3aADqarvNJpszV6JsF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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