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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d99a43ce932621ba5e4229152e16024f2bec0039bbef9d180063827a439c524' 
  AND token = 'vrmUc85UGGTQ0X10fGeFx+bu0qq3ACfpCCxppVCTI6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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