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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1238e6ad2597274423131ebf53d0489d047602806cd2007a4c3d36633d64583d' 
  AND token = 'wzMpKmamh+TqA5Iaqo81V6qryQQhaAkrpr3/SF9bl6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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