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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '028b0aa5d085029bae7191fe610e95e946e0f9d35a29ab111be2fd1c4ea2f10e' 
  AND token = 'Px2BLmWQWhRMYU5pU5D5iHZuLcMykLAGch6+sJpbUII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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