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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9501223487b33e33436c41aca1aa06b987e195b3498595513b917f6713c8ff88' 
  AND token = '5RUhYyRRfDHJEE6kUypOq5fyyoq3en8NgFo+SwgaouU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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