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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04d5e0c76e776fe6f650b977fefc34edaa19c61cef053da209d312dd70832e3d' 
  AND token = 'nkSkJCPrNsoxmVIi2rGX8rvv1GbJN8If2ZygX4gsi1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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