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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9eb3db2e299cd359a54ade509a6e394ebd36445e5cf68e90a1d9f66df40d3b2' 
  AND token = 'taSotcaE1T3fJ8KhUwhFoA8RvNE708VIoiMK5+QcfLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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