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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '817b580e828c04ee8484fa1cf4669a3c3c331d3f1eb4c69eee853e8cf6d9fda2' 
  AND token = '1MkhCXv3M3fBcwEBvJvCtET7SaHsWrtdv3h/RX60jiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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